Question
How does the electric field inside a dielectric decrease when it is placed in an external electric field?
✓
Answer
When a dielectric is placed in an external electric field, the charges are induced on the faces of dielectric which produce opposite electric field in the dielectric. Thus net electric field inside the dielectric is reduced.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A convex lens of refractive index 1.5 has a focal length of 18cm in air. Calculate the change in its focal length when it is immersed in water of refractive index $\frac{4}{3}$
→Derive an expression for the resistivity of a good conductor, in terms of the relaxation time of electrons.
The output of an OR gate is connected to both the inputs of a NAND gate. Draw the logic circuit of this combination of getes and write its truth table.
A conducting disc of radius r rotates with a small but constant angular velocity $\omega$ about its axis. A uniform magnetic field B exists parallel to the axis of rotation. Find the motional emf between the centre and the periphery of the disc.
→The angles of dip at two places located on the earth are 0° and 90° respectively. Where are the places located?
A current is induced in coil $C_1$ due to the motion of current carrying coil $C_2$. (a) Write any two ways by which a large deflection can be obtained in the galvanometer G. (b) Suggest an alternative device to demonstrate the induced current in place of a galvanometer.
→Define electric flux. Write its S.I. units. A spherical rubber balloon carries a charge that is uniformly distributed over its surface. As the balloon is blown up and increases in size, how does the total electric flux coming out of the surface change? Give reason.
Explain the lateral shift for a ray refracted from a glass slab with parallel sides.
If work function of the metal is $3.31 \times 1.6 \times$ $10^{-19}$ Joule, then calculate its threshold frequency in hertz.
→The radius of a spherical conductor shell is $R$ and the charge on it is $Q$. Compare the potential at a distance 2 R from the centre of the sphere with the potential at a distance $R / 2$.
→